Bottom front corner of the door is a common spot.
Have someone shine a flashlight from outside the Jeep around the door edge and look for light coming through. If light comes through so does water.
If that doesn't work drive through a carwash and watch in awe as the water pours in.
In the end you may be able to fix it you may not.
You dealer may help, they may not.
Some Wranglers leak, some don't. Water is very good at finding ways in.
I've fixed 3 out of 5 leaks in mine and thats as good as I could get.
I wouldn't fret it too much.
Fix the big one's buy some Shamwows for the little ones.